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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) - Fair Value Inputs Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 150 $ 669 $ 744 $ 649
Total gains/(losses) included in earnings, assets 0 5 31 32
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (5) (613) (12)
Sales, assets (47) 0 (61) 0
Transfers into level 3, assets 4 0 4 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 105 669 105 669
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 4 25 30
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Beginning balance, fair value liabilities 395 432 462 500
Total (gains)/losses included in earnings, liabilities (7) 19 31 15
Unrealized (gains)/losses included in OCI, liabilities 10 (6) (10) (56)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (4) (4) (84) (18)
Sales, liabilities 0 0 (5) 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 394 441 394 441
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (9) 17 10 9
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 10 (5) 9 (54)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 129 116 120 136
Total gains/(losses) included in earnings, assets (3) 2 31 (11)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (4) (13) (11)
Sales, assets (47) 0 (61) 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 77 114 77 114
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (4) 1 21 (13)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   524 604 486
Total gains/(losses) included in earnings, assets   6 (4) 44
Unrealized gains/(losses) included in OCI, assets   0 0 0
Purchases, assets   0 0 0
Issuances, assets   0 0 0
Settlements, assets   0 (600) 0
Sales, assets   0 0 0
Transfers into level 3, assets   0 0 0
Transfers out of level 3, assets   0 0 0
Ending balance, fair value assets 0 530 0 530
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   6 0 44
Change in unrealized gains/(losses) for the period included in OCI for Assets still held   0 0 0
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0   0  
Total gains/(losses) included in earnings, assets 0   0  
Unrealized gains/(losses) included in OCI, assets 0   0  
Purchases, assets 0   0  
Issuances, assets 0   0  
Settlements, assets 0   0  
Sales, assets 0   0  
Transfers into level 3, assets 4   4  
Transfers out of level 3, assets 0   0  
Ending balance, fair value assets 4   4  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0   0  
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0   0  
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1   1
Total gains/(losses) included in earnings, assets   0   0
Unrealized gains/(losses) included in OCI, assets   0   0
Purchases, assets   0   0
Issuances, assets   0   0
Settlements, assets   (1)   (1)
Sales, assets   0   0
Transfers into level 3, assets   0   0
Transfers out of level 3, assets   0   0
Ending balance, fair value assets   0   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0   0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held   0   0
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 105 96 110 108
Total (gains)/losses included in earnings, liabilities (4) 8 (13) 8
Unrealized (gains)/losses included in OCI, liabilities 1 (3) 5 (15)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 102 101 102 101
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (4) 8 (13) 8
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 1 (3) 5 (15)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   8   7
Total (gains)/losses included in earnings, liabilities   0   1
Unrealized (gains)/losses included in OCI, liabilities   0   0
Purchases, liabilities   0   0
Issuances, liabilities   0   0
Settlements, liabilities   0   0
Sales, liabilities   0   0
Transfers into Level 3, liabilities   0   0
Transfers out of Level 3, liabilities   0   0
Ending balance, fair value liabilities   8   8
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities   0   1
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held   0   0
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   37 49 34
Total (gains)/losses included in earnings, liabilities   1 0 4
Unrealized (gains)/losses included in OCI, liabilities   0 0 0
Purchases, liabilities   0 0 0
Issuances, liabilities   0 0 0
Settlements, liabilities   0 (49) 0
Sales, liabilities   0 0 0
Transfers into Level 3, liabilities   0 0 0
Transfers out of Level 3, liabilities   0 0 0
Ending balance, fair value liabilities 0 38 0 38
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities   1 0 4
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held   0 0 0
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 290 291 303 347
Total (gains)/losses included in earnings, liabilities (3) 10 44 2
Unrealized (gains)/losses included in OCI, liabilities 9 (3) (15) (41)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (4) (4) (35) (14)
Sales, liabilities 0 0 (5) 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 292 294 292 294
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (5) 8 23 (4)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 9 (2) 4 (39)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 8 14 6 8
Total gains/(losses) included in earnings, assets 1 (2) 3 4
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 9 12 9 12
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 (2) 3 4
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 13 14 14 18
Total gains/(losses) included in earnings, assets 2 (1) 1 (5)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 15 13 15 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 (1) 1 (5)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held $ 0 0 $ 0 0
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities       4
Total (gains)/losses included in earnings, liabilities       0
Unrealized (gains)/losses included in OCI, liabilities       0
Purchases, liabilities       0
Issuances, liabilities       0
Settlements, liabilities       (4)
Sales, liabilities       0
Transfers into Level 3, liabilities       0
Transfers out of Level 3, liabilities       0
Ending balance, fair value liabilities   $ 0   0
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities       0
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held       $ 0